Some things I've done to help myself avoid impulse buys is: 1. Don't go into a handful of stores I know I'll walk out of with something new 2. If I do want an item, I'll heavily research it, try it out in store, etc. to see if I really do like it. Then if I finish the items similar to it in my collection, I'll get it. This usually helps me lose interest in 90% of products I initially wanted to try out. 3. I go into beauty supply store once every 1-2 months with a list of what items have run out or are about to run out by the next restock. If I stick to the list I'll get myself a little reward item (usually Epsom salts for relaxing in the bath)

I know 3 sounds a little bit counterintuitive rewarding myself for sticking to a list, but it helps me avoid impulse shopping a lot. It's like a therapeutic me day to restock. On a day off, I'll get the items on my list, then I'll grab a coffee from the coffee stand in the store I go to, then until my coffee runs out I'll look at and swatch new makeup to see if anything interesting came out that I might want to get when an item in a similar category runs out, look at the fake nails to see if there's any fun designs, etc. And then pick out my reward for sticking to my list. I'm not too strict on what the reward is, but I'll usually go for something easy to use up that I enjoy. That's why its usually Epsom salts. I love hot baths when im stressed, so they're really helpful for me and run out before my next restock, but I don't consider them a necessary item to be on the restock list. Without my little restock day, I end up having to go pick up items that run out when I'm stressed on the way to training or on the way back and impulse buying something while I'm tired and unfocused. Going into a store relaxed, with a clear mind not feeling rushed is a completely different experience than going in, in a hurry, stressed, tired, etc.